Sheetal Jain, who served as Amitabh Bachchan's secretary for more than 35 years and also produced his film 'Bade Miyan Chote Miyan', has passed away at the age of 77. Trade analyst Komal Nahta took to Twitter to announce the news on Saturday. Several Bollywood celebrities, including Anupam Kher and Madhur Bhandarkar, offered their condolences upon his demise.